大跨桥梁转体系统中球铰接触面应力计算

兰州理工大学学报 ›› 2023, Vol. 49 ›› Issue (4): 122-128.

大跨桥梁转体系统中球铰接触面应力计算

李天平^*1, 李文洲²

1.甘肃建筑职业技术学院建筑工程系, 甘肃兰州 730050;
2.甘肃省公路交通建设集团有限公司, 甘肃兰州 730030

收稿日期:2023-02-28 出版日期:2023-08-28 发布日期:2023-08-29
通讯作者: 李天平(1983-),男,河南新乡人,副教授. Email:724946416@qq.com
基金资助:
国家自然科学基金(51868045)

Stress calculation of spherical hinge contact surface in swivel system of long-span bridge

LI Tian-ping¹, LI Wen-zhou²

1. Department of Architectural Engineering,Gansu Vocational College of Architecture, Lanzhou 730050, China;
2. Gansu Province Highway Traffic Construction Group Co. Ltd., Lanzhou 730030, China

Received:2023-02-28 Online:2023-08-28 Published:2023-08-29

摘要/Abstract

摘要： 为研究大跨桥梁转体施工中球铰接触面在法向载荷作用下的接触问题,基于Hertz理论,对转体接触面进行简化,首先系统分析了球铰的力学特性,研究了转体接触面间微凸体的接触特性;推导了转体接触面内应力的计算公式,分析了转体接触面内应力分布,描述了转体接触面应力分布特点.然后由单对微凸体扩展到转体接触面计算得到接触应力;结果表明在接触界面上,径向应力随着距离球铰中心距离的增加而增加,上下球铰压应力呈现中间小边缘大的特点.最后,理论模型与数值模拟结果进行对比,理论结果与数值模拟结果吻合较好(误差<5%),这为对球铰的设计和制造提供理论指导,以及提升转体施工的安全性,推动转体施工工艺进一步向大跨径、大吨位方向发展提供了计算依据.

关键词: 桥梁工程, 转动系统, 接触界面, 力学特性, 接触应力

Abstract: In order to study the contact problem of the spherical hinge contact surface under normal load during the rotation construction of large span bridges, the rotation contact surface was simplified based on Hertz theory. First, the mechanical characteristics of the spherical hinge were systematically analyzed, and the contact characteristics of the micro convex bodies between the rotation contact surfaces were studied. The calculation formula for the internal stress of the rotating contact surface was then derived, followed by the analysis of the stress distribution in the rotating contact surface, and the description of the stress distribution characteristics of the rotating contact surface. Afterward, the contact stress was calculated by extending a single pair of micro convex bodies to the contact surface of the rotating body. The results show that at the contact interface, the radial stress increases with the increase of the distance from the center of the spherical joint, and the compressive stress of the upper and lower spherical joints presents the characteristics of small middle edges and large edges. Finally, the theoretical model was compared with the numerical simulation results, and the theoretical results are in good agreement with the numerical simulation results (error<5%), which provides theoretical guidance for the designation and manufacturation of spherical joints, improving the safety of swivel construction, and promoting the further development of swivel construction technology towards large span diameter and large tonnage.

Key words: bridge engineering, rotating system, contact interface, mechanical properties, contact stress

中图分类号:

TB125

李天平, 李文洲. 大跨桥梁转体系统中球铰接触面应力计算[J]. 兰州理工大学学报, 2023, 49(4): 122-128.

LI Tian-ping, LI Wen-zhou. Stress calculation of spherical hinge contact surface in swivel system of long-span bridge[J]. Journal of Lanzhou University of Technology, 2023, 49(4): 122-128.

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